Communicate with cRIO when IP Address and DNS Name changes over Network Variables

[Quintino]

I am developing a LabVIEW software for an European Project using cRIO-9074 and RT Application Reployment to update all cRIO devices with the last version.

To communicate with the cRIO devices I have also developed some applications that are outside cRIO on LabVIEW Project that uses Network Variables to Read/Write to the devices.

When I am developing the software, everything works just fine because the LabVIEW Project knows the IP Address on my cRIO device. However, when I use RTAD to install the software and then my applications outside the LabVIEW Project, the aplications are, not always able to find the device when the IP address changes.

I have tried to replace the IP Address with the DNS Name but no success. When I change the router that is connected to the cRIO, the DNS Name also changes.

With this, my question is how can I solve this sistematic problem? Should I change any configuration on MAX, in LabVIEW Project and/or in the applications to be able to always find the cRIO? Is it possible to have a field on the application to insert the IP Address of the device to connect? If yes, how can I do this?

Best regards,

[Wayne.C]

Quintino,

You can programatically open connecitons to Shared Variables.  This allows you to decide at runtime the IP address, lib name and SV name you wish to connect to.  I've attached a vi snippet the demonstrats an Action Engine to handle the connection to a SV named "Parameters".

I normally store the cRIO_Settings in a .INI file that is easy to modify.